install.settings - This file is used only once - to tell CintaNotes which language has been selected when the installer was run. But since it has to be in the Program Files folder, it cannot be deleted by CintaNotes (the folder is not writable).
Maybe it's clear but I would like to remind that the settings file is now stored in a per-user location, into the %AppData% folder (the "%" signs means that %AppData% is a variable, that once typed into Windows Explorer will expand to the actual location).